hasBeenCalled example

$this->response = null;
        $this->responses = null;
        $this->cacheConfig = null;
        $this->catch = null;
        $this->esi = null;

        $this->clearDirectory(sys_get_temp_dir().'/http_cache');
    }

    public function assertHttpKernelIsCalled()
    {
        $this->assertTrue($this->kernel->hasBeenCalled());
    }

    public function assertHttpKernelIsNotCalled()
    {
        $this->assertFalse($this->kernel->hasBeenCalled());
    }

    public function assertResponseOk()
    {
        $this->assertEquals(200, $this->response->getStatusCode());
    }